Citation: | WANG Yanbin, WANG Hao, REN Liudong, JIAO Yongyan, TONG Laixi, WILLIAMS Ian S. 2021. Zircon U-Pb ages of the mafic gneiss and leucogneiss from the Bailey Peninsula: Constraints on the timing of the tectonothermal events related to the amalgamation of Rodinia in the Windmill Islands, East Antarctica. Journal of Geomechanics, 27(5): 768-782. doi: 10.12090/j.issn.1006-6616.2021.27.05.063 |
We report new geochronological data of the mafic gneiss and leucogneiss from the Windmill Islands, East Antarctica, in order to unravel the tectonothermal events related to the amalgamation of Rodinia. SHRIMP zircon U-Pb dating from the mafic gneiss (Hbl-Cpx-Opx-Bt-Pl-Qtz-Mag-Zrn) yielded early Mesoproterozoic magmatic ages of 1403±28 Ma from igneous cores, and middle Mesoproterozoic metamorphic ages of 1318±34 Ma from overgrown rims. The leucogneiss (Pl-Kfs-Qtz-Bt-Zrn) in the Bailey Peninsula has intrusive ages of 1257±51 Ma from magmatic origin zircon cores, and metamorphic ages of 1197±26 Ma from overgrown rims and/or structureless grains. The intrusive age of mafic gneiss indicates the existence of a ca.1.40 Ga igneous activity in the Windmill Islands. This is likely the earliest igneous record of the Windmill Islands, possibly relating to the final period of igneous activity of the Mawson Continent. The age of high-grade metamorphism of the mafic gneiss from the Bailey Peninsula can be constrained by the metamorphic zircon overgrowth at 1318±34 Ma, suggesting that the Windmill Islands was possibly involved in the Albany-Fraser-Windmill (East Antarctic) orogeny during the 1375~1151 Ma period. This study further supports the tectonic model in which the Windmill Islands and the Albany-Fraser Orogeny are parallel convergence during the Mesoproterozoic Rodinia amalgamation.
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Sketch geological map of the Windmill Islands (modified after Zhang et al., 2012)
Geological map of the Bailey Peninsula (modified after Paul et al., 1995)
Micrographs showing petrographic features of the mafic gneiss and leucogneiss in the Bailey Peninsula, Windmill Islands
Characteristic images of the analyzed zircons from the mafic gneiss and leucogneiss in the Bailey Peninsula
U-Pb concordia diagram of zircons from the mafic gneiss in the Bailey Peninsula
U-Pb concordia diagram of the zircons from the leucogneiss in the Bailey Peninsula
Tectonic map of Antarctica and Australia in a Gondwana configuration(modified after Liu et al., 2018)